Drill 1018 cold rolled steel with HSS at about 80 SFM: 611 RPM for a 1/2 inch drill, 1,222 RPM for 1/4 inch, feeding about 0.0037 in/rev at 1/4 inch.
What RPM and feed for 1018 cold rolled steel?
| Drill | RPM | Feed (in/rev) | Feed (IPM, capped 2500 RPM) |
|---|---|---|---|
| 0.0625" | 4,889 | 0.0009 | 2.34 |
| 0.125" | 2,445 | 0.0019 | 4.58 |
| 0.1875" | 1,630 | 0.0028 | 4.58 |
| 0.25" | 1,222 | 0.0037 | 4.58 |
| 0.3125" | 978 | 0.0047 | 4.58 |
| 0.375" | 815 | 0.0056 | 4.58 |
| 0.5" | 611 | 0.0075 | 4.58 |
| 0.625" | 489 | 0.0094 | 4.58 |
| 0.75" | 407 | 0.0112 | 4.58 |
Tools for cutting 1018 cold rolled steel
How does 1018 cold rolled steel machine?
1018 cold rolled is the most common hobby steel. It tears and leaves a poor finish at low speeds with a dull tool, so a sharp tool, a real depth of cut and cutting oil matter more than the exact speed.
Why a HSS twist drill?
Twist drill speeds are set lower than turning speeds because the cutting edge is buried in the hole with no escape for heat. Peck deep holes (clear chips every one to two diameters), and use cutting oil in everything except cast iron, brass and plastics.
Adjust speeds with the RPM calculator and milling feeds with the feed rate calculator. The cutting speed chart compares every material.
Frequently asked questions
What SFM for 1018 cold rolled steel?
A starting surface speed of 100 SFM with HSS and 350 SFM with carbide, and 80 SFM for HSS drills. These are conservative for hobby machines; raise them in steps if the chips come off clean and the tool stays cool. 1018 cold rolled steel rates fair (about 70%) for machinability.
What happens if my machine cannot reach the RPM?
Run at your top speed. Running below the ideal surface speed only makes the job slower; it does not damage the tool. For milling and drilling, keep the chip load per tooth or feed per revolution the same so the edge keeps cutting instead of rubbing, which lowers the feed in inches per minute in proportion.
Other tools in 1018 cold rolled steel
Other materials with a HSS drill
- 6061-T6 aluminum
- 7075-T6 aluminum
- 360 free-machining brass
- 932 bearing bronze
- 110 copper
- 12L14 leaded steel
- 1045 medium carbon steel
- 4140 alloy steel (annealed)
- All